| 摘要 |
An apparatus includes a controller (102, 700) configured to be coupled to a system clock (104) that generates a clock signal for a device (106, 600) that generates radiated electromagnetic interference (RE) (108, 608). The controller is also configured to determine (201) a frequency span associated with the system clock, where the frequency span has a minimum frequency and a maximum frequency. The controller is further configured to determine (202-208) a sequence of frequency steps (300), where each frequency step is associated with a distinct frequency within the frequency span. In addition, the controller is configured to control (209) the system clock to change a frequency of the clock signal through the sequence of frequency steps in order to reduce the RE generated at or by the device. In some embodiments, the frequency steps are interleaved (208) across the frequency span to avoid large frequency jumps. In some embodiments, the frequency step duration is optimally selected to reduce quasi peak values. |
